*{
    margin: 0;
    padding: 0;
}
ul li{
    list-style: none;
}
/*html{
max-width: 640px;
}*/
.select{
    width: 100%;
    margin-top: 0.31rem;
    display: block;
    min-height: 0.5rem;
}
.select p{
    float: left;
    font-size: 0.23rem;
    border-radius: 3px;
    padding: 0.05rem 0.1rem;
}
.select p:first-child{
    background: #6ab494;
    color: white;
    margin-left: 0.5rem;
}
.select p:nth-child(2){
    background:#fc9b13;
    color: #ffffff;
    margin-left: 0.2rem;
}
.select p:nth-child(2) span:nth-child(2){
    background: #ffffff;
    color: #fc9b13;
    padding: 0.04rem 0.05rem;
}
.select p:nth-child(3){
    background: #f76249;
    color: #ffffff;
    margin-left: 0.2rem;
}
.select p:nth-child(3) span:nth-child(2){
    background: #ffffff;
    color: #f76249;
    padding: 0.04rem 0.06rem;
}
/*练习题部分*/
.main{
    width: 100%;
    margin: 0 auto;
}
.main_wrap1 {
    width:100%;
}
.main_wrap1 .topic{
    overflow: hidden;
    margin-top: 0.3rem;
    margin-left: -0.1rem;

}
.main_wrap1 .topic span{
    font-size: 0.4rem;
    display: block;
}
.main_wrap1 .topic span:first-child{

    padding-left: 0.5rem;
}
.main_wrap1 .topic span:nth-child(2){
    margin-top: -0.54rem;
    margin-left: 1rem;
}
/*tu*/
.print{
    width:90%;
    height: 3rem;
    background: #d3d3d3;
    margin-left: 0.5rem;
    margin-top: 0.5rem;
}
.print img{
    width: 100%;
    height: 4rem;
}
.key ul{
    /*border-top: 1px solid #e6e6e6;
    margin-top: 0.39rem;*/
   display: -webkit-box;
   display: -ms-flexbox;
   display: -webkit-flex;
   display: flex;

    flex-wrap: wrap;
    -ms-flex-wrap: wrap ;
    -webkit-flex-wrap:  wrap;

    width: 100%;
    margin: 0 auto;

    flex-direction: row;
	-ms-flex-direction: row;
	-webkit-flex-direction: row;

    justify-content:center;
    -webkit-justify-content: center;
}
.key ul li{
    /* float: left;
    text-align: center;
    width: 40%;
    padding:0.3rem 1rem 0.3rem 0.9rem;
    min-height: 1rem;
    border: 1px solid red;
    margin-left: 0.5rem*/
    width: 45%;
    margin-top: 0.5rem;


    margin-left: 0.3rem
}
.key ul li span{
    font-size: 0.36rem;
    display: block;
    float: left;
}
.key ul li span:first-child{
    width: 0.8rem;
    height: 0.8rem;
    border: 1px solid #4e4e4e;
    border-radius: 50%;
    text-align: center;
    line-height: 0.8rem;
    color: #51514f;
    display: block;
    float: left;
    margin-top: 0.02rem
}
.key ul li span:nth-child(2){
    /*height: 0.8rem;*/
    text-align: center;
    /* line-height: 0.8rem;*/
    padding-left: 10px;
    /*margin-top: -0.6rem;*/
    /* margin-left: 0.8rem;*/
    /* width: 2.8rem;*/
    margin-top: 0.2rem;
    float:left;
    display: block;
    width: 60%;
    word-wrap:break-word;
}
.analysis{
    width: 100%;
    border-top: 1px solid #e6e6e6;
    margin-top: 0.3rem;
    overflow: hidden;
}
.analysis span:first-child{
    font-size: 0.36rem;
    margin: 0.2rem 0 0 0.5rem;
    color: #999999;
    display: block;
}
.analysis p{
    font-size: 0.35rem;
    margin: 0.2rem 0 0 0.5rem;
    display: block;
}
.analysis span:last-child{
    display: inline-block;
    width: 100%;
    text-align: center;

}
#navigation{
    position: fixed;
    bottom: 0;
    min-height: 0.7rem;
    border-top: 1px solid #999999;
    overflow: hidden;
    background: #ffffff;
    width: 100%;
    padding-bottom: 0.3rem;
}
#navigation ul li{
    float: left;
}
.main button{
    width: 2.5rem;
    height: 1rem;
    background:#fc9e16;
    /* display: block; */
    font-size: 0.36rem;
    border-radius: 10px;
    /* margin: 0 auto; */
    margin-left: calc((100% - 2.5rem) / 2);
    border: none;
    color: #fff;
    margin-top: 1rem;
    margin-bottom: 1.5rem;
}
/*收藏题弹出部分*/
.collects_title {
   display: -webkit-box;         display: -ms-flexbox;         display: -webkit-flex;         display: flex;
    justify-content: space-between;
    margin-top: 0.35rem;
}
.collects_title img{
    width: 0.4rem;
    height: 0.4rem;
    vertical-align: top;
}
.collects_title_left {
    font-size: 0.4rem;
    padding-left: 0.15rem;
    line-height: 0.4rem;
}
.collects_title_right {
    font-size: 0.4rem;
   display: -webkit-box;         display: -ms-flexbox;         display: -webkit-flex;         display: flex;
    justify-content: space-between;
    padding-right:0.2rem;
    line-height: 0.4rem;
}
.collects_title_right figure{
    margin-left: 0.5rem;
}
